Description | Materials | Building | Sound Demos | User Manual | Construction Manual | Order online | FAQ
The Polysex mod adds an additional control panel to your Korg Polysix synthesizer to increase the number of possible sounds you can create.
There are two different mods which can both be used at the same time:
The pitch mod routes the envelope to the pitch. You can choose the polarity of the envelope and the reference point in the envelope where the pitch is not changed. This mod is very useful to create portamento like effects, brass instruments, percussive sounds and much more.
The second mod is the voice spread mod which is a very powerful tool. You can determine the amount of voice spread, route the envelope and one of two LFOs to it and switch voice spreading on and off in poly mode. This mod can be used to adjust and modulate the fatness of the sound in unison mode, in poly mode you can modulate how detuned the Polysix sounds. This can lead to more natural sounds, but can also be used to accomplish complex sound effects.
The kit includes a PCB, all necessary parts and a front panel which you can use to mount the controls onto your Polysix. The front panel is black anodized aluminum with blue and white offset printing and done in Polysix style (see images above and below). Note that the blue color matches that of the Polysix very well. It is possible to use black knobs provided with the kit or the original Polysix style knobs (not included). The black knobs have a similar feel compared to the original knobs.
Both PCB and front panel have been produced in Germany.
Is it difficult to build?
No! The Polysex mod was designed as a kit, which means I tried to make it as easy as possible to assemble and install it. You will need basic soldering and metal work skills, but nothing you can’t learn by watching half an hour of a soldering tutorial on youtube. You will have to drill some holes into the metal casing of the Polysix, but precision is not needed because everything is covered by the front panel and will look very nice. Also have a look at the construction manual.
None of these sound examples make use of the effect section of the Polysix (or any external effects)
All demos are licensed under a CC BY-NC-ND licence.
This user manual can be found as PDF here: Tubbutec Polysex – User Manual
The Polysex mod is devided into two parts: The voice spread mod and pitch mod.
The ‘AMOUNT’ knob adjusts the amount of voice spread, the ‘EG AMOUNT’ the amount of modulation by the envelope and ‘MOD AMOUNT’ the amount of modulation by one of the two build in LFOs (low frequency oscillators). You can chose between two modulation sources with the ‘MOD SRC’ switch. You can either select ‘MG’, the Polysix’s modulation generator, or ‘PWM’, the Polysix’s PWM modulation generator. Use the ‘PWM Speed’ knob in the VCO section to control its speed.
The ‘POLY MODE’ switch defines weather voice spread is activated in polyphonic mode (ON) or just in unison mode (OFF).
The pitch mod routes the Polysix’s envelope (EG) to the voice pitch. This can be used for example for portamento like sounds, percussive instruments, brass sounds and a wide range of experimental sounds. You can chose the amount of the modulation with the knob labeled ‘EG AMOUNT’. Furthermore you can chose the polarity of the envelope with the ‘POLARITY’ switch. If the switch is in the upper position, the voice will pitch up during the attack phase and pitch down during the decay and release phase. With the switch in the lower position, the voice will pitch down during the attack phase and pitch up afterwards.
You can also select the reference point of the pitch change with the ‘REFERENCE’ switch. This is the point in the envelope where no pitch change takes place. It can be selected to either be the sustain level, or the zero level as indicated by the dashed lines in the pictograms. The ‘REFERENCE’ switch also acts on the voice spread section.
A contruction manual as PFD can be found here: Polysex construction manual (newest version: v1.3)
There also is a video describing the mechanical construction, a second one showing you how to solder is being made (although you should be able to manage by reading the manual). Need help or have any questions? Contact us
Here you can order the Polysix mod online. You can chose between different versions below. We ship from Germany and the shipping costs depend on the destination country. If you want us to install the mod for you please contact us.
Full kit including PCB, all necessary parts, front panel and black knobs. The knobs have a similar feel compared to the Polysix knobs and you can also use the original ones.
Price: 149€ + shipping 2
Order at Tubbutec Shop
PCB assembled kit
Kit containing an already assembled and tested PCB, all necessary further parts, front panel and black knobs. The knobs have a similar feel compared to the Polysix knobs and you can also use the original ones.
Price: 179€ + shipping 2
Order at Tubbutec Shop
Installed by Tubbutec
Polysex mod installed by us, tested and ready to use
Price: 350€ 2
Q: Is the Polysex mod compatible with the Kiwisix retrofit?
A: Yes, but unfortunately the Kiwisix does not provide the same analog signals as the original board. For this reason the PWM and MG modulations for voice spread will not work. The rest works though.
There are multiple possibilities to still get a decent modulation:
- You can use the effect board LFO. Descriptions will be provided by us how to do this.
- There is a square wave with the same frequency as the MG on board KLM-396. It is on the connector going to the mod wheels and it is pin 6 labelled LFO. Just use this point and connect it to the Polysex board instead of the usual MG connection.
This is not the same effect, but gives you some interesting effects.
- Build your own LFO. This is actually very simple and only requires a couple of parts. There a tons of schematics on the internet. Downside: you need to install an extra pot to adjust the frequency.
Q: Is the Polysex mod compatible with other midi retrofits?
A: As far as I know it is compatible with every other midi retrofit, such as PolysixM, CHD’s P6-KBD or Korg PS6-MRK, and of course the upcoming one from Tubbutec. If in doubt contact us.
Q: Are you selling parts of the kit (such as the PCB only), can provide schematics or graphic files?
Due to § 19 UStG no additional VAT is added, nor is it included.